This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鉙 is a rare character composed of 金 (metal) and 只. The exact historical origin and original meaning are uncertain.
The left side is metal 金, and the right side is 只. Without a clear meaning, picture a mysterious metal object marked only with the symbol 只.
For タイ, imagine tying a tag to this unknown metal piece: tie -> タイ, and the tag helps identify the mysterious 鉙.